. A civic biology : presented in problems. Biology; Sanitation. 208 THE ECONOMIC IMPORTANCE OF ANIMALS the comb. It is now thinner than what we call honey. To thicken it, the bees swarm over the open cells, moving their wings very rapidly, thus evaporating some of the water. A hive of bees have been known to make over thirty-one pounds of honey in a single day, although the average is very much less than this. It is estimated from twenty to thirty millions of dollars' worth of honey and wax are produced each year in this country. Cochineal and Lac. - - Among other products of insect origin is
. A civic biology : presented in problems. Biology; Sanitation. 208 THE ECONOMIC IMPORTANCE OF ANIMALS the comb. It is now thinner than what we call honey. To thicken it, the bees swarm over the open cells, moving their wings very rapidly, thus evaporating some of the water. A hive of bees have been known to make over thirty-one pounds of honey in a single day, although the average is very much less than this. It is estimated from twenty to thirty millions of dollars' worth of honey and wax are produced each year in this country. Cochineal and Lac. - - Among other products of insect origin is cochineal, a red coloring matter, which consists of the dried bodies of a tiny insect, one of the plant lice which lives on the cactus plants in Mexico and Central America. The lac insect, another one of the plant lice, feeds on the juices of certain trees in India and pours out a substance from its body which after treatment forms shellac. Shel- lac is of much use as a basis for varnish. Gall Insects. - - Oak galls, growths caused by the sting of wasp-like insects, give us prod- ucts used in ink making, in tan- ning, and in making pyrogaliic acid which is much used in developing photographs. Insects destroy Harmful Plants or Animals. — Some forms of animal life are of great importance because of their de- struction of harmful plants or animals. A near relative of the bee, called the ichneumon fly, does man indirectly considerable good because of its habit of laying its eggs and rearing the young in the bodies of caterpillars which are harmful to vegetation. Some of the ichneumons even bore into trees in order to deposit their eggs in the larvae of wood-boring insects. It is safe to say that the ichneumons save millions of dollars yearly to this country. Several beetles are of value to man. Most important of these. An insect friend of man. An ichneumon fly boring in a tree to lay its eggs in the burrow of a boring insect harmful to that Please note that these images ar
Size: 1538px × 1624px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookpublishernewyorkamericanbookcompany, booksubjectbiology
